Here's a plush that's likely to be uncommon. It was made by "Fun4All", who didn't seem to do a lot of Sonic stuff. It was released in 2003 (if at all) however, notice how it has SA1 branding, even though that's a bit late. The gimmick for the doll is that it has bendy wire inside so you can supposedly stand & pose him. It may have even been in the hands, notice how it's sort of 'fist pose' there. You can certainly tell one of the arms is posing a bit. The doll itself however...isn't the best. The feet are really...tall? What's with the horizontal white line?

The "soap shoe" more complex shoe design didn't show up until SA2, if this is what it was trying to go for. They also left off his ear borders. The black marker on the paper tag appears to be some inventory code or something. It's possible that this is a prototype version or something similar. Either way, it's interesting to see.